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Finding the Fourth Proportional to 82.31, 123.29 and 38.91

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Solution

The fourth proportional to 82.31, 123.29 and 38.91 is: 58.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.31 : 123.29 = 38.91 : x
  2. Step 2: Convert to fraction form
    82.31/123.29 = 38.91/x
  3. Step 3: Cross multiply
    82.31x = 123.29 × 38.91
  4. Step 4: Simplify right side
    82.31x = 4,797.02
  5. Step 5: Solve for x
    x = 4,797.02/82.31
  6. Step 6: Final answer
    x = 58.28

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.